| //===--- ConstantPropagation.cpp - Constant fold and diagnose overflows ---===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "constant-propagation" |
| #include "swift/SILOptimizer/PassManager/Transforms.h" |
| #include "swift/SILOptimizer/Utils/SILOptFunctionBuilder.h" |
| #include "swift/SILOptimizer/Utils/ConstantFolding.h" |
| |
| using namespace swift; |
| |
| //===----------------------------------------------------------------------===// |
| // Top Level Driver |
| //===----------------------------------------------------------------------===// |
| |
| namespace { |
| |
| class ConstantPropagation : public SILFunctionTransform { |
| bool EnableDiagnostics; |
| |
| public: |
| ConstantPropagation(bool EnableDiagnostics) : |
| EnableDiagnostics(EnableDiagnostics) {} |
| |
| private: |
| /// The entry point to the transformation. |
| void run() override { |
| SILOptFunctionBuilder FuncBuilder(*this); |
| ConstantFolder Folder(FuncBuilder, getOptions().AssertConfig, |
| EnableDiagnostics); |
| Folder.initializeWorklist(*getFunction()); |
| auto Invalidation = Folder.processWorkList(); |
| |
| if (Invalidation != SILAnalysis::InvalidationKind::Nothing) { |
| invalidateAnalysis(Invalidation); |
| } |
| } |
| }; |
| |
| } // end anonymous namespace |
| |
| SILTransform *swift::createDiagnosticConstantPropagation() { |
| // Diagostic propagation is rerun on deserialized SIL because it is sensitive |
| // to assert configuration. |
| return new ConstantPropagation(true /*enable diagnostics*/); |
| } |
| |
| SILTransform *swift::createPerformanceConstantPropagation() { |
| return new ConstantPropagation(false /*disable diagnostics*/); |
| } |